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Truth function/Lewis: should represent the belief systems of people. - They do not have to be realistic. Propositions: should be truth functions. - The indicative conditional must have a fixed interpretation of different beliefs - this makes it a probability conditional.
Non- truth-functional/conditional/Lewis: instead: deductive roles of normal connections: instead of equivalence: Inter- deducibility. - Instead of incompatibility: deductive inconsistency instead of necessity: deducibility. - ((s) Deduction does not refer to truth, but to internal correctness.) ((s) > provability).
Die Identität von Körper und Geist Frankfurt 1989
Konventionen Berlin 1975
Philosophical Papers Bd I New York Oxford 1983
Philosophical Papers Bd II New York Oxford 1986
Cl. I. Lewis
Mind and the World Order: Outline of a Theory of Knowledge (Dover Books on Western Philosophy) 1991